H-Q characteristic shows how pump head depends on flow 

Characteristics of a pump

Q-efficiency  characteristic shows how the efficiency of a pump depends on the pump flow (Q).

Q-Power characteristic shows how shaft power absorbed by the pump depends on the pump flow.

BEP - best efficiency point. The point on the Q-H curve at what the pump has the highest efficiency. 

Q-NPSH characteristic shows how NPSH depends on the pump capacity.

NPSH (Net Positive Suction Head ) is the parameter which characterizes the suction capability of a pump.


The example of pump characteristics presented in a catalog of pump manufacturers. 

Characteristics of pumps

Pump pressure or pump head is the difference between pressure or head at the pump inlet and outlet. 

Sometimes users forget about inlet pressure and consider only pressure in the outlet.